Double plug adapter



FIG. 1 is a perspective view of a double plug adapter in accordance witha preferred embodiment of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a first side elevational view thereof and a mirror image ofthe opposite side thereof.

The broken lines shown in FIGS. 1, 3, and 4-6 are for purposes ofillustrating environmental structure and form no part of the claimeddesign.

The ornamental design for a double plug adapter, as shown and described.